Look here http://www.volny.cz/veitel/prelude/vtec.mp3 at the noise my engine is making. It is Prelude 1995 VTEC with H22 engine with 80000km (60000miles).

The strange sound is going from the timing belt location, not from the balancer belt or any power steering, alternator etc. It makes the sound only at 1000rpm, I can go there from idle or droping from higher RPMs, it doesn't matter. It does not make it anywhere else in the RPM band. Basically when the engine stays idle, the sound is normal (listen beginning of the MP3). When I just touch the gas pedal, so the RPMs goes to cca 1000, the strange sound starts. When I go higher (1100rpm or so), the sound disappears. What can it be??

The sound is since I have my engine rebuild, autotensioner removed, checked and installed back. It looked fully functional. Anyway, I'm going to make the auto to manual tensioner conversion.